1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 #include <sys/param.h>
30 #include <sys/ioctl.h>
34 /***************Begin MY defs*********************/
36 char registers
[REGISTER_BYTES
];
38 /* Index within `registers' of the first byte of the space for
42 char buf2
[MAX_REGISTER_RAW_SIZE
];
43 /***************End MY defs*********************/
45 #include <sys/ptrace.h>
46 #include <machine/reg.h>
48 extern char **environ
;
50 extern int inferior_pid
;
51 void quit (), perror_with_name ();
54 /* Start an inferior process and returns its pid.
55 ALLARGS is a vector of program-name and args.
56 ENV is the environment vector to pass. */
59 create_inferior (program
, allargs
)
67 perror_with_name ("fork");
71 ptrace (PT_TRACE_ME
, 0, 0, 0, 0);
73 execv (program
, allargs
);
75 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
76 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
84 /* Kill the inferior process. Make us have no inferior. */
89 if (inferior_pid
== 0)
91 ptrace (8, inferior_pid
, 0, 0, 0);
93 /*************inferior_died ();****VK**************/
96 /* Return nonzero if the given thread is still alive. */
104 /* Wait for process, returns status */
114 if (pid
!= inferior_pid
)
115 perror_with_name ("wait");
119 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
121 return ((unsigned char) WEXITSTATUS (w
));
123 else if (!WIFSTOPPED (w
))
125 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
127 return ((unsigned char) WTERMSIG (w
));
130 fetch_inferior_registers (0);
133 return ((unsigned char) WSTOPSIG (w
));
136 /* Resume execution of the inferior process.
137 If STEP is nonzero, single-step it.
138 If SIGNAL is nonzero, give it that signal. */
141 myresume (step
, signal
)
146 ptrace (step
? PT_STEP
: PT_CONTINUE
, inferior_pid
, 1, signal
, 0);
148 perror_with_name ("ptrace");
152 #if !defined (offsetof)
153 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
156 /* U_REGS_OFFSET is the offset of the registers within the u area. */
157 #if !defined (U_REGS_OFFSET)
158 #define U_REGS_OFFSET \
159 ptrace (PT_READ_U, inferior_pid, \
160 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
165 register_addr (regno
, blockend
)
171 if (regno
< 0 || regno
>= ARCH_NUM_REGS
)
172 error ("Invalid register number %d.", regno
);
174 REGISTER_U_ADDR (addr
, blockend
, regno
);
179 /* Fetch one register. */
182 fetch_register (regno
)
185 register unsigned int regaddr
;
186 char buf
[MAX_REGISTER_RAW_SIZE
];
189 /* Offset of registers within the u area. */
192 offset
= U_REGS_OFFSET
;
194 regaddr
= register_addr (regno
, offset
);
195 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
198 *(int *) ®isters
[ regno
* 4 + i
] = ptrace (PT_RUREGS
, inferior_pid
,
199 (PTRACE_ARG3_TYPE
) regaddr
, 0, 0);
200 regaddr
+= sizeof (int);
203 /* Warning, not error, in case we are attached; sometimes the
204 kernel doesn't let us at the registers. */
205 char *err
= strerror (errno
);
206 char *msg
= alloca (strlen (err
) + 128);
207 sprintf (msg
, "reading register %d: %s", regno
, err
);
215 /* Fetch all registers, or just one, from the child process. */
218 fetch_inferior_registers (regno
)
221 if (regno
== -1 || regno
== 0)
222 for (regno
= 0; regno
< NUM_REGS
; regno
++)
223 fetch_register (regno
);
225 fetch_register (regno
);
228 /* Store our register values back into the inferior.
229 If REGNO is -1, do this for all registers.
230 Otherwise, REGNO specifies which register (so we can save time). */
233 store_inferior_registers (regno
)
236 register unsigned int regaddr
;
238 extern char registers
[];
240 unsigned int offset
= U_REGS_OFFSET
;
245 if (CANNOT_STORE_REGISTER (regno
))
247 regaddr
= register_addr (regno
, offset
);
249 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
251 scratch
= *(int *) ®isters
[REGISTER_BYTE (regno
)] | 0x3;
252 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
256 /* Error, even if attached. Failing to write these two
257 registers is pretty serious. */
258 sprintf (buf
, "writing register number %d", regno
);
259 perror_with_name (buf
);
263 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
266 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
267 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
], 0);
270 /* Warning, not error, in case we are attached; sometimes the
271 kernel doesn't let us at the registers. */
272 char *err
= strerror (errno
);
273 char *msg
= alloca (strlen (err
) + 128);
274 sprintf (msg
, "writing register %d: %s",
279 regaddr
+= sizeof(int);
283 for (regno
= 0; regno
< NUM_REGS
; regno
++)
284 store_inferior_registers (regno
);
287 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
288 in the NEW_SUN_PTRACE case.
289 It ought to be straightforward. But it appears that writing did
290 not write the data that I specified. I cannot understand where
291 it got the data that it actually did write. */
293 /* Copy LEN bytes from inferior's memory starting at MEMADDR
294 to debugger memory starting at MYADDR. */
296 read_inferior_memory (memaddr
, myaddr
, len
)
302 /* Round starting address down to longword boundary. */
303 register CORE_ADDR addr
= memaddr
& -sizeof (int);
304 /* Round ending address up; get number of longwords that makes. */
306 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
307 /* Allocate buffer of that many longwords. */
308 register int *buffer
= (int *) alloca (count
* sizeof (int));
310 /* Read all the longwords */
311 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
313 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0, 0);
316 /* Copy appropriate bytes out of the buffer. */
317 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
320 /* Copy LEN bytes of data from debugger memory at MYADDR
321 to inferior's memory at MEMADDR.
322 On failure (cannot write the inferior)
323 returns the value of errno. */
326 write_inferior_memory (memaddr
, myaddr
, len
)
332 /* Round starting address down to longword boundary. */
333 register CORE_ADDR addr
= memaddr
& -sizeof (int);
334 /* Round ending address up; get number of longwords that makes. */
336 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
337 /* Allocate buffer of that many longwords. */
338 register int *buffer
= (int *) alloca (count
* sizeof (int));
341 /* Fill start and end extra bytes of buffer with existing memory data. */
343 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0, 0);
348 = ptrace (1, inferior_pid
,
349 addr
+ (count
- 1) * sizeof (int), 0, 0);
352 /* Copy data to be written over corresponding part of buffer */
354 memcpy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
356 /* Write the entire buffer. */
358 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
361 ptrace (4, inferior_pid
, addr
, buffer
[i
], 0);
378 return inferior_pid
!= 0;
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